Solid-state battery cell manufacturing method, solid-state battery cell, battery, and electrical device

Abstract

The present application relates to the technical field of batteries, and provides a solid-state battery cell manufacturing method, a solid-state battery cell, a battery, and an electrical device. The solid-state battery cell manufacturing method comprises: providing a first electrode sheet; soaking the first electrode sheet in a solid-state electrolyte slurry, such that the solid-state electrolyte slurry is adhered to the outer surface of a first active material layer of the first electrode sheet and a solid-state electrolyte layer is formed; and disposing a second electrode sheet on the outer surface of the solid-state electrolyte layer, such that the solid-state electrolyte layer is located between the first active material layer of the first electrode sheet and a second active material layer of the second electrode sheet, wherein the polarities of the first electrode sheet and the second electrode sheet are opposite. The solid-state battery cell manufactured by this manufacturing method can improve the fit between the first active material layer and the solid-state electrolyte layer, resulting in better adhesion between the first active material layer and the solid-state electrolyte layer, and thus improving the contact performance and contact area between the first active material layer and the solid-state electrolyte layer.

Description

Manufacturing method of solid-state battery cell, solid-state battery cell, battery, and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application 2024110349101, filed on July 30, 2024, entitled “Manufacturing method of solid-state battery cell, solid-state battery cell, battery, and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a manufacturing method of a solid-state battery cell, a solid-state battery cell, a battery, and an electric device. BACKGROUND

[0003] In recent years, new energy vehicles have made a leap in development. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing, among which, batteries as core components of new energy vehicles have higher requirements in terms of use stability and service life.

[0004] In battery technology, in order to improve the energy density and charging speed of the battery, the battery is usually set as a solid-state battery, that is, the solid-state battery includes a box body and a solid-state battery cell contained in the box body. However, the production quality of the existing solid-state battery cell is poor, which leads to poor use performance of the solid-state battery cell. SUMMARY

[0005] The embodiments of the present application provide a manufacturing method of a solid-state battery cell, a solid-state battery cell, a battery, and an electric device, which can effectively improve the use performance of the solid-state battery cell.

[0006] In a first aspect, the embodiments of the present application provide a manufacturing method of a solid-state battery cell, including: providing a first electrode sheet; soaking the first electrode sheet in a solid-state electrolyte slurry to attach the solid-state electrolyte slurry on an outer surface of a first active material layer of the first electrode sheet and form a solid-state electrolyte layer; and disposing a second electrode sheet on an outer surface of the solid-state electrolyte layer, so that the solid-state electrolyte layer is located between the first active material layer of the first electrode sheet and a second active material layer of the second electrode sheet, and the polarity of the first electrode sheet is opposite to that of the second electrode sheet.

[0007] In the technical solution, the first pole piece is first soaked in the solid-state electrolyte slurry to adhere the solid-state electrolyte slurry to the outer surface of the first active material layer of the first pole piece and form a solid-state electrolyte layer, and then the second pole piece is arranged on the outer surface of the solid-state electrolyte layer to form a solid-state battery cell with the solid-state electrolyte layer located between the first active material layer of the first pole piece and the second active material layer of the second pole piece. The solid-state battery cell manufactured by the manufacturing method can improve the fit between the outer surface of the first active material layer and the inner surface of the solid-state electrolyte layer, so that the adhesion between the first active material layer and the solid-state electrolyte layer is better, thereby the contact effect and contact area between the first active material layer and the solid-state electrolyte layer are not affected by the flatness or thickness consistency of the first active material layer and the solid-state electrolyte layer, and the contact effect and contact area between the first active material layer and the solid-state electrolyte layer are improved, which is beneficial to improve the production quality and use performance of the solid-state battery cell.

[0008] In some embodiments, the providing the first pole piece comprises: providing a first current collector; and soaking the first current collector in a first active material slurry to adhere the first active material slurry to the outer surface of the first current collector and form the first active material layer.

[0009] In the technical solution, the first pole piece is first soaked in the solid-state electrolyte slurry to adhere the solid-state electrolyte slurry to the outer surface of the first active material layer of the first pole piece and form a solid-state electrolyte layer, and then the second pole piece is arranged on the outer surface of the solid-state electrolyte layer to form a solid-state battery cell with the solid-state electrolyte layer located between the first active material layer of the first pole piece and the second active material layer of the second pole piece. The solid-state battery cell manufactured by the manufacturing method can improve the fit between the outer surface of the first active material layer and the inner surface of the solid-state electrolyte layer, so that the adhesion between the first active material layer and the solid-state electrolyte layer is better, thereby the contact effect and contact area between the first active material layer and the solid-state electrolyte layer are not affected by the flatness or thickness consistency of the first active material layer and the solid-state electrolyte layer, and the contact effect and contact area between the first active material layer and the solid-state electrolyte layer are improved, which is beneficial to improve the production quality and use performance of the solid-state battery cell.

[0010] In some embodiments, the soaking the first current collector in a first active material slurry to adhere the first active material slurry to the outer surface of the first current collector and form the first active material layer comprises: soaking one end of the first current collector in the first active material slurry to adhere the first active material slurry to the outer peripheral surface of the first current collector and the end surface of the end of the first current collector soaked in the first active material slurry and form the first active material layer.

[0011] In the technical solution, the one end of the first current collector is soaked in the first active material slurry in the process of producing the first electrode sheet, so that the first active material slurry can be attached to the outer circumferential surface of the first current collector and the end surface of the one end of the first current collector to form the first active material layer, so that the first active material layer covers the outer side of the first current collector and forms a shell-shaped structure with the one end open. The solid-state battery produced by the manufacturing method can further improve the stability of the first active material layer arranged on the first current collector, reduce the phenomenon of mutual separation of the first active material layer and the first current collector, increase the amount of the first active material layer attached to the outer surface of the first current collector, and improve the capacitance of the solid-state battery.

[0012] In some embodiments, after the first current collector is soaked in the first active material slurry to attach the first active material slurry to the outer surface of the first current collector and form the first active material layer, the providing the first electrode sheet further includes drying the first active material layer.

[0013] In the technical solution, the first current collector is soaked in the first active material slurry to form the first active material layer, and then the first active material layer is dried, which can improve the drying efficiency of the first active material layer, improve the production efficiency of the solid-state battery, reduce the phenomenon of local shedding of the first active material layer during drying, improve the production quality of the first electrode sheet, improve the stability of the first active material layer arranged on the first current collector, facilitate the attachment of the solid-state electrolyte slurry to the outer surface of the first active material layer to form the solid-state electrolyte layer, improve the quality of the solid-state electrolyte layer covering the outer surface of the first active material layer, and improve the production quality of the solid-state battery.

[0014] In some embodiments, the arranging the second electrode sheet on the outer surface of the solid-state electrolyte layer, so that the solid-state electrolyte layer is located between the first active material layer of the first electrode sheet and the second active material layer of the second electrode sheet includes: soaking the solid-state electrolyte layer in a second active material slurry to attach the second active material slurry to the outer surface of the solid-state electrolyte layer and form the second active material layer; and arranging a second current collector on the outer surface of the second active material layer.

[0015] In the above technical solution, in the production process of setting the second pole piece on the outer surface of the solid-state electrolyte layer, the first pole piece provided with the solid-state electrolyte layer is first soaked in the second active material slurry to attach the second active material slurry on the outer surface of the solid-state electrolyte layer and form a second active material layer, and then the second current collector is set on the outer surface of the second active material layer to realize the setting of the second pole piece on the outer surface of the solid-state electrolyte layer. The solid-state battery cell manufactured by the manufacturing method can improve the fit between the outer surface of the solid-state electrolyte layer and the inner surface of the second active material layer, so that the adhesion effect between the second active material layer and the solid-state electrolyte layer is better, thereby the contact effect and contact area between the second active material layer and the solid-state electrolyte layer are not affected by the flatness or thickness consistency of the second active material layer and the solid-state electrolyte layer, and the contact effect and contact area between the second active material layer and the solid-state electrolyte layer are improved, which is beneficial to further improve the production quality and use performance of the solid-state battery cell.

[0016] In some embodiments, the setting of the second current collector on the outer surface of the second active material layer comprises: soaking the second active material layer in a metal liquid in a molten state to attach the metal liquid on the outer surface of the second active material layer, and the metal liquid attached on the outer surface of the second active material layer solidifies to form the second current collector.

[0017] In the above technical solution, after the second active material layer is set on the outer surface of the solid-state electrolyte layer, the first pole piece provided with the solid-state electrolyte layer and the second active material layer is soaked in a metal liquid in a molten state, and the metal liquid attached on the outer surface of the second active material layer solidifies to form a second current collector, thereby setting the second current collector on the outer surface of the second active material layer to form a second pole piece. The solid-state battery cell manufactured by the manufacturing method is easy to manufacture, which is beneficial to reduce the difficulty of forming the second current collector on the outer surface of the second active material layer, thereby improving the production efficiency of the solid-state battery cell. On the other hand, the fit between the inner surface of the second current collector and the outer surface of the second active material layer is improved, so that the adhesion effect between the second active material layer and the second current collector is better, which is beneficial to improve the firmness and stability of the second active material layer set on the second current collector, to reduce the phenomenon that the second active material layer and the second current collector are separated from each other, and to further improve the production quality and use performance of the solid-state battery cell.

[0018] In some embodiments, the soaking the solid-state electrolyte layer in the second active material slurry to attach the second active material slurry on the outer surface of the solid-state electrolyte layer and form the second active material layer comprises: soaking one end of the solid-state electrolyte layer in the second active material slurry to attach the second active material slurry on both the outer circumferential surface of the solid-state electrolyte layer and the end surface of the one end of the solid-state electrolyte layer soaked in the second active material slurry, and form the second active material layer.

[0019] In the above technical solution, the one end of the solid-state electrolyte layer is soaked in the second active material slurry in the process of arranging the second electrode tab on the outer surface of the solid-state electrolyte, so that the second active material slurry can be attached on both the outer circumferential surface of the solid-state electrolyte layer and the end surface of the one end of the solid-state electrolyte layer, and the second active material layer is formed, so that the second active material layer is wrapped on the outer side of the solid-state electrolyte layer and forms a shell-shaped structure with one end open. The solid-state battery cell manufactured by this manufacturing method can further improve the firmness and stability of the second active material layer arranged on the solid-state electrolyte layer, which is conducive to reducing the phenomenon of mutual separation of the second active material layer and the solid-state electrolyte layer, and can also increase the amount of the second active material layer attached on the outer surface of the solid-state electrolyte layer, which is conducive to improving the capacitance of the solid-state battery cell.

[0020] In some embodiments, before the second current collector is arranged on the outer surface of the second active material layer, the second electrode tab is arranged on the outer surface of the solid-state electrolyte layer so that the solid-state electrolyte layer is located between the first active material layer of the first electrode tab and the second active material layer of the second electrode tab further comprises: drying the second active material layer.

[0021] In the above technical solution, the second active material layer formed on the outer surface of the solid-state electrolyte layer is dried before the second current collector is arranged on the outer surface of the second active material layer. On the one hand, this can improve the drying efficiency of the second active material layer, which is conducive to improving the production efficiency of the solid-state battery cell and reducing the phenomenon of local shedding of the second active material layer during drying, thereby improving the production quality of the solid-state battery cell and improving the stability of the second active material layer arranged on the outer surface of the solid-state electrolyte layer. On the other hand, this can facilitate the subsequent arrangement of the second current collector on the outer surface of the second active material layer, which is conducive to improving the quality of the second current collector arranged on the outer surface of the second active material layer, thereby improving the production quality of the solid-state battery cell.

[0022] In some embodiments, the disposing the second electrode tab on the outer surface of the solid-state electrolyte layer, such that the solid-state electrolyte layer is located between the first active material layer of the first electrode tab and the second active material layer of the second electrode tab comprises: providing a second current collector, the second current collector having an accommodation space formed therein and open at one end; injecting a second active material slurry into the accommodation space; and inserting the solid-state electrolyte layer into the second active material slurry to form the second active material layer on a side of the second current collector facing the solid-state electrolyte layer.

[0023] In the above technical solution, in the process of disposing the second electrode tab on the outer surface of the solid-state electrolyte layer, the second current collector is first disposed in a structure having an accommodation space formed therein and open at one end, then the second active material slurry is injected into the accommodation space, and finally the first electrode tab provided with the solid-state electrolyte layer is inserted into the second active material slurry to form the second active material layer between the second current collector and the solid-state electrolyte layer, thereby achieving the disposing of the second electrode tab on the outer surface of the solid-state electrolyte layer. The solid-state battery cell manufactured by using this manufacturing method can reduce the difficulty of disposing the second electrode tab on the outer surface of the solid-state electrolyte layer and facilitate the implementation, and can improve the fit between the outer surface of the solid-state electrolyte layer and the inner surface of the second active material layer and between the outer surface of the second active material layer and the inner surface of the second current collector, so that the adhesion between the second active material layer and the solid-state electrolyte layer and between the second active material layer and the second current collector is better, thereby improving the contact effect and contact area between the second active material layer and the solid-state electrolyte layer and between the second active material layer and the second current collector, and further improving the production quality and use performance of the solid-state battery cell.

[0024] In some embodiments, after the inserting the solid-state electrolyte layer into the second active material slurry to form the second active material layer on a side of the second current collector facing the solid-state electrolyte layer, the disposing the second electrode tab on the outer surface of the solid-state electrolyte layer, such that the solid-state electrolyte layer is located between the first active material layer of the first electrode tab and the second active material layer of the second electrode tab further comprises: drying the second active material layer.

[0025] In the above technical solution, after the solid-state electrolyte is inserted into the second active material slurry and the second active material layer is formed between the second current collector and the solid-state electrolyte layer, the second active material layer is dried, which is beneficial to improve the drying efficiency of the second active material layer disposed between the second current collector and the solid-state electrolyte layer, thereby improving the production efficiency of the solid-state battery cell.

[0026] In some embodiments, the soaking the first pole piece in the solid-state electrolyte slurry to attach the solid-state electrolyte slurry on the outer surface of the first active material layer of the first pole piece and form a solid-state electrolyte layer comprises: soaking one end of the first pole piece in the solid-state electrolyte slurry to attach the solid-state electrolyte slurry on both the outer circumferential surface of the first pole piece and the end surface of the end of the first pole piece soaked in the solid-state electrolyte slurry and form the solid-state electrolyte layer.

[0027] In the above technical solution, by soaking one end of the first pole piece in the solid-state electrolyte slurry, the solid-state electrolyte slurry can be attached on both the outer circumferential surface of the first pole piece and the end surface of the end of the first pole piece, and the solid-state electrolyte layer is formed. Therefore, the solid-state electrolyte layer is wrapped on the outer side of the first pole piece and forms a shell-shaped structure with one end open. The solid-state battery cell manufactured by this manufacturing method can further improve the effect of the solid-state electrolyte layer separating the first active material layer of the first pole piece and the second active material layer of the second pole piece, which is beneficial to reduce the risk of short circuit of the solid-state battery cell during use.

[0028] In some embodiments, before the second pole piece is arranged on the outer surface of the solid-state electrolyte layer so that the solid-state electrolyte layer is located between the first active material layer of the first pole piece and the second active material layer of the second pole piece, the manufacturing method of the solid-state battery cell further comprises: drying the solid-state electrolyte layer.

[0029] In the above technical solution, the solid-state electrolyte layer is dried before the second pole piece is arranged on the outer surface of the solid-state electrolyte. On the one hand, this can improve the efficiency of the solid-state electrolyte layer, which is beneficial to improve the production efficiency of the solid-state battery cell and reduce the phenomenon of local shedding of the solid-state electrolyte layer during drying, thereby improving the production quality of the solid-state battery cell and improving the stability of the solid-state electrolyte layer arranged on the first active material layer. On the other hand, this can facilitate the subsequent arrangement of the second pole piece on the outer surface of the solid-state electrolyte layer, which is beneficial to improve the quality of the arrangement of the second pole piece on the solid-state electrolyte layer, thereby improving the production quality of the solid-state battery cell.

[0030] In a second aspect, the embodiments of the present application also provide a solid-state battery cell, comprising a first pole piece, a solid-state electrolyte layer and a second pole piece; the first pole piece comprises a first active material layer; the solid-state electrolyte layer is wrapped on the outer surface of the first active material layer; the second pole piece is opposite in polarity to the first pole piece, and the second pole piece comprises a second active material layer, and the second active material layer is wrapped on the outer surface of the solid-state electrolyte layer.

[0031] In the above technical solution, by setting the solid electrolyte layer as a structure covering the outer surface of the first active material layer, and setting the second active material layer of the second electrode as a structure covering the outer surface of the solid electrolyte layer, a solid cell structure is formed in which the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode. The solid cell with this structure can realize that the first electrode, the solid electrolyte layer and the second electrode are sequentially covered from the inside to the outside. On the one hand, it can reduce the manufacturing difficulty of the solid cell and help improve the production efficiency of the solid cell. On the other hand, it can alleviate the difficulty of aligning the edges of the first electrode, the solid electrolyte layer and the second electrode, and reduce the phenomenon of stress concentration and damage at the edges of the first electrode and the second electrode, thereby effectively improving the production quality of the solid cell.

[0032] In some embodiments, the second electrode forms a receiving cavity with an opening located at one end of the second electrode in a first direction; wherein at least a portion of the first electrode is inserted into the receiving cavity from the opening along the first direction, and the solid electrolyte layer is located between the outer surface of the first active material layer and the inner surface of the second active material layer.

[0033] In the above technical solution, the second electrode forms an open cavity. The first electrode is inserted into the cavity from the opening along the first direction, and the solid electrolyte layer is disposed between the outer surface of the first electrode and the inner surface of the second electrode. This achieves a structure in which the first electrode, the solid electrolyte layer, and the second electrode are sequentially covered from the inside out. The structure is simple and easy to manufacture.

[0034] In some embodiments, along the first direction, the first active material layer does not extend beyond the end of the solid electrolyte layer near the opening.

[0035] In the above technical solution, by setting the first active material layer of the first electrode to not extend beyond the end of the solid electrolyte layer near the opening in the first direction, the effect of the solid electrolyte layer separating the first active material layer of the first electrode and the second active material layer of the second electrode can be improved. This helps to reduce the short circuit phenomenon between the first electrode and the second electrode, thereby reducing the risk of internal short circuit in the solid cell during use.

[0036] In some embodiments, along the first direction, the second active material layer does not extend beyond the end of the solid electrolyte layer near the opening.

[0037] In the above technical solution, by setting the second active material layer of the second electrode to not extend beyond the end of the solid electrolyte layer near the opening in the first direction, the effect of the solid electrolyte layer separating the first active material layer of the first electrode and the second active material layer of the second electrode can be improved. This helps to reduce the short circuit phenomenon between the first electrode and the second electrode, thereby reducing the risk of internal short circuits in the solid cell during use.

[0038] In some embodiments, along the first direction, one end of the first electrode extends out of the receiving cavity; wherein, the solid-state battery cell further includes an electrode lead-out portion electrically connected to the first electrode, the electrode lead-out portion being located at the end of the second electrode where the opening is formed.

[0039] In the above technical solution, by setting one end of the first electrode in the first direction to extend out of the receiving cavity, and by providing an electrode lead-out portion electrically connected to the first electrode on the side where the second electrode forms an opening, the electrode lead-out portion can input or output the electrical energy of the first electrode. The solid-state battery cell with this structure can reduce the difficulty of inputting or outputting electrical energy of the first electrode of the solid-state battery cell, and can also reduce the difficulty of subsequent assembly of the solid-state battery cell into groups.

[0040] In some embodiments, the electrode lead-out covers the opening along the first direction.

[0041] In the above technical solution, by setting the electrode lead-out part to cover the opening of the second electrode plate along the first direction, the electrode lead-out part can not only realize the input or output of electrical energy of the first electrode plate, but also play a certain role in blocking the opening. This helps to alleviate the phenomenon of impurities or other substances entering the cavity from the opening, thereby reducing the risk of solid-state cells being damaged or internally short-circuited during use.

[0042] In some embodiments, the solid-state battery cell further includes an insulating member; the insulating member is disposed between the electrode lead-out portion and the second electrode plate along the first direction to insulate and isolate the electrode lead-out portion and the second electrode plate.

[0043] In the above technical solution, the solid-state battery cell is also provided with an insulating component, which is disposed in the first direction between the electrode lead and the second electrode, so that the insulating component can provide insulation and isolation between the electrode lead and the second electrode, thereby reducing the risk of short circuit between the electrode lead and the second electrode, and thus effectively improving the reliability of the solid-state battery cell.

[0044] In some embodiments, the first electrode further includes a first current collector; the first current collector is inserted into the receiving cavity from the opening along the first direction, and one end of the first current collector extends out of the receiving cavity and is connected to the electrode lead-out portion; the first active material layer is disposed on the outer surface of the portion of the first current collector inserted into the receiving cavity, and the first active material layer is located between the first current collector and the solid electrolyte layer; wherein, in the same plane perpendicular to the first direction, the area of ​​the orthographic projection of the first current collector is smaller than the area of ​​the orthographic projection of the electrode lead-out portion.

[0045] In the above technical solution, by setting the area of ​​the electrode lead-out portion projected in the first direction to be larger than the area of ​​the first current collector projected in the first direction, the area of ​​the electrode lead-out portion used for interconnection with other components is larger than that of the first current collector. This effectively increases the area of ​​the first electrode of the solid-state battery cell used for interconnection with other components. On the one hand, it reduces the difficulty of subsequent assembly of the solid-state battery cell and is conducive to improving the assembly efficiency of the solid-state battery cell. On the other hand, it increases the current flow area between the first electrode of the solid-state battery cell and other components, which is conducive to improving the performance of the solid-state battery cell.

[0046] In some embodiments, the electrode lead-out portion is integrally formed with the first current collector.

[0047] In the above technical solution, by setting the electrode lead-out portion and the first current collector of the first electrode plate as an integrally formed structure, the connection reliability and stability between the electrode lead-out portion and the first current collector can be improved, which helps to reduce the phenomenon of the electrode lead-out portion and the first current collector separating from each other during use, thereby reducing the risk of connection failure of solid-state battery cells during use.

[0048] In some embodiments, the solid-state battery cell is cylindrical.

[0049] In the above technical solution, by setting the solid-state battery cell to a cylindrical shape, the difficulty of sequentially covering the first electrode, solid electrolyte layer and second electrode from the inside out can be reduced, and the shape regularity of the first electrode, solid electrolyte layer and second electrode can be improved, which is conducive to further reducing the manufacturing difficulty of the solid-state battery cell. On the other hand, it can also further alleviate the difficulty of aligning the edges of the first electrode, solid electrolyte layer and second electrode, which is conducive to further improving the production quality of the solid-state battery cell.

[0050] Thirdly, embodiments of this application also provide a battery, including the aforementioned solid-state battery cell.

[0051] Fourthly, embodiments of this application also provide an electrical device, including the battery described above, wherein the battery is used to provide electrical energy. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0053] Figure 1 is a schematic diagram of the vehicle structure provided in some embodiments of this application;

[0054] Figure 2 is a schematic diagram of the battery structure provided in some embodiments of this application;

[0055] Figure 3 is an exploded view of the battery structure provided in some embodiments of this application;

[0056] Figure 4 is a schematic diagram of the structure of a solid-state battery cell provided in some embodiments of this application;

[0057] Figure 5 is a cross-sectional view of a solid-state battery cell provided in some embodiments of this application, perpendicular to the first direction;

[0058] Figure 6 is a cross-sectional view of a solid-state battery cell provided in some embodiments of this application, parallel to a first direction;

[0059] Figure 7 is a schematic flowchart of a method for manufacturing a solid-state battery cell according to some embodiments of this application;

[0060] Figure 8 is a flowchart illustrating step S100 of a solid-state battery cell manufacturing method provided in some embodiments of this application;

[0061] Figure 9 is a flowchart illustrating steps S100 and S120 of a solid-state battery cell manufacturing method provided in some embodiments of this application.

[0062] Figure 10 is a flowchart illustrating step S300 of a solid-state battery cell manufacturing method provided in some embodiments of this application;

[0063] Figure 11 is a flowchart illustrating step S320 of the solid-state battery cell manufacturing method provided in some embodiments of this application;

[0064] Figure 12 is a flowchart illustrating step S310 of the solid-state battery cell manufacturing method provided in some embodiments of this application;

[0065] Figure 13 is a flowchart illustrating step S300 of a method for manufacturing a solid-state battery cell according to some embodiments of this application;

[0066] Figure 14 is a flowchart illustrating step S200 of a solid-state battery cell manufacturing method provided in some embodiments of this application.

[0067] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Solid Cell; 21 - First Electrode; 211 - First Active Material Layer; 212 - First Current Collector; 22 - Solid Electrolyte Layer; 23 - Second Electrode; 231 - Second Active Material Layer; 232 - Second Current Collector; 2321 - Receiving Space; 233 - Opening; 234 - Receiving Cavity; 24 - Electrode Lead-out; 25 - Insulator; 200 - Controller; 300 - Motor; X - First Direction. Detailed Implementation

[0068] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0070] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0072] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0073] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0074] In this application, "multiple" means two or more (including two).

[0075] In this embodiment of the application, the solid-state battery cell can be a secondary battery. A secondary battery refers to a solid-state battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0076] Solid-state batteries can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc., and the embodiments of this application are not limited to these.

[0077] Solid-state battery cells typically consist of a positive electrode, a negative electrode, and an isolation component. During the charging and discharging process of a solid-state battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The isolation component, placed between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0078] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0079] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0080] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0081] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM) 622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0082] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0083] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0084] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0085] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0086] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0087] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in solid-state battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0088] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0089] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0090] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0091] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0092] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0093] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0094] In some implementations, the solid-state battery cell has a wound structure. The positive and negative electrode plates are wound into a wound structure.

[0095] In some implementations, the solid-state battery cell has a stacked structure.

[0096] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0097] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0098] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0099] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0100] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0101] In some implementations, the solid-state battery cell can be cylindrical, flat, or polygonal, etc.

[0102] As an example, solid-state cells can be cylindrical solid-state cells, prismatic solid-state cells, pouch solid-state cells, or solid-state cells of other shapes.

[0103] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more solid-state cells to provide higher voltage and capacity.

[0104] In some embodiments, the battery can be a battery module. When there are multiple solid-state cells, the multiple solid-state cells are arranged and fixed to form a battery module.

[0105] In some embodiments, the battery can be a battery pack, which includes a housing and solid-state cells, with the solid-state cells or battery modules housed within the housing.

[0106] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0107] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0108] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Of course, the battery's manufacturing quality and subsequent performance in use also need to be taken into account.

[0109] In battery technology, to improve energy density and charging speed, batteries are typically designed as solid-state batteries. This means a solid-state battery consists of a casing and solid-state cells housed within it. In related technologies, a solid-state cell includes a positive electrode, a negative electrode, and a solid electrolyte layer disposed between the positive and negative electrodes. However, because electron and ion transfer between the positive electrode, solid electrolyte layer, and negative electrode in a solid-state cell occurs through particle-to-particle contact, solid-state cells require high levels of flatness and thickness consistency in these components. Therefore, solid-state cells in related technologies typically employ… Traditional coating processes involve coating an active material layer onto a current collector and then stacking the positive electrode, negative electrode, and solid electrolyte layers together to form a solid-state battery cell. However, this method cannot achieve complete adhesion between the contact surfaces of the positive electrode, negative electrode, and solid electrolyte layers. Due to the influence of flatness and thickness consistency, solid-state batteries produced by this method often exhibit poor adhesion between the positive electrode, negative electrode, and solid electrolyte layers. This can easily lead to a smaller contact area and poor contact between the positive electrode, negative electrode, and solid electrolyte layers, which is detrimental to improving the performance of solid-state batteries.

[0110] Based on the above considerations, in order to solve the problem of poor performance of solid-state battery cells, this application provides a method for manufacturing a solid-state battery cell. The method includes: providing a first electrode; immersing the first electrode in a solid electrolyte slurry to attach the solid electrolyte slurry to the outer surface of the first active material layer of the first electrode and form a solid electrolyte layer; and disposing a second electrode on the outer surface of the solid electrolyte layer so that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, wherein the polarities of the first electrode and the second electrode are opposite.

[0111] In this solid-state battery cell manufacturing method, the first electrode is first immersed in a solid electrolyte slurry to adhere the solid electrolyte slurry to the outer surface of the first active material layer of the first electrode, thus forming a solid electrolyte layer. Then, the second electrode is placed on the outer surface of the solid electrolyte layer, forming a solid-state battery cell with the solid electrolyte layer located between the first active material layer of the first electrode and the second active material layer of the second electrode. Solid-state batteries manufactured using this method can improve the fit between the outer surface of the first active material layer and the inner surface of the solid electrolyte layer, resulting in better adhesion between the two layers. This ensures that the contact effect and contact area between the first active material layer and the solid electrolyte layer are not affected by the flatness or thickness consistency of the two layers, thereby improving the contact effect and contact area and enhancing the production quality and performance of the solid-state battery cell.

[0112] The solid-state battery cell manufacturing method disclosed in this application can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be composed of solid-state batteries and other components disclosed in this application. This helps alleviate the problem of poor manufacturing quality of solid-state batteries and improves their performance.

[0113] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0114] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0115] Please refer to Figure 1, which is a structural schematic diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is installed inside the vehicle 1000. The battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0116] In some embodiments of this application, the battery 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0117] Please refer to Figures 2 and 3. Figure 2 is a schematic diagram of the structure of the battery 100 provided in some embodiments of this application, and Figure 3 is an exploded view of the structure of the battery 100 provided in some embodiments of this application. The battery 100 includes a housing 10 and a solid-state cell 20, which is housed within the housing 10.

[0118] The housing 10 provides an assembly space for the solid-state battery cell 20, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other, and together define an assembly space for accommodating the solid-state battery cell 20. The second housing body 12 may be a hollow structure with one end open, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; the first housing body 11 and the second housing body 12 may also be hollow structures with one side open, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0119] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes. For example, the shape of the box 10 formed by the first box body 11 and the second box body 12 can be a cylinder, a cuboid, or a cube. For example, in Figure 2, the shape of the box 10 formed by the first box body 11 and the second box body 12 is a cuboid.

[0120] In the battery 100, there can be one or more solid-state cells 20 disposed within the housing 10. When there are multiple solid-state cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple solid-state cells 20 are connected in both series and parallel configurations. Multiple solid-state cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple solid-state cells 20 is housed within the housing 10. Alternatively, the battery 100 can also be composed of multiple solid-state cells 20 first connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0121] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar for connecting multiple solid-state cells 20 to achieve electrical connection between the multiple solid-state cells 20.

[0122] For example, in FIG3, the solid-state battery cell 20 has a cylindrical structure, and the central axis of the solid-state battery cell 20 extends along the first direction X.

[0123] According to some embodiments of this application, referring to FIG3, and further referring to FIG4, 5 and 6, FIG4 is a structural schematic diagram of a solid-state battery cell 20 provided in some embodiments of this application, FIG5 is a cross-sectional view of a solid-state battery cell 20 provided in some embodiments of this application perpendicular to the first direction X, and FIG6 is a cross-sectional view of a solid-state battery cell 20 provided in some embodiments of this application parallel to the first direction X. This application provides a solid-state battery cell 20, which includes a first electrode 21, a solid electrolyte layer 22 and a second electrode 23. The first electrode 21 includes a first active material layer 211, and the solid electrolyte layer 22 covers the outer surface of the first active material layer 211. The second electrode 23 has the opposite polarity to the first electrode 21 and includes a second active material layer 231, which covers the outer surface of the solid electrolyte layer 22.

[0124] The first electrode 21 and the second electrode 23 have opposite polarities, meaning that the first electrode 21 and the second electrode 23 are used for inputting or outputting the positive and negative electrodes of the solid-state battery cell 20, respectively. The first electrode 21 includes a first current collector 212 and a first active material layer 211 disposed on the surface of the first current collector 212 facing the solid electrolyte layer 22, such that the first current collector 212 is located on the side of the first active material layer 211 facing away from the solid electrolyte layer 22. Correspondingly, the second electrode 23 includes a second current collector 232 and a second active material layer 231 disposed on the surface of the second current collector 232 facing the solid electrolyte layer 22, such that the second current collector 232 is located on the side of the second active material layer 231 facing away from the solid electrolyte layer 22, so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, such that both sides of the solid electrolyte layer 22 are respectively disposed facing the first active material layer 211 and the second active material layer 231.

[0125] For example, if the first electrode 21 is a negative electrode, then the second electrode 23 is a positive electrode. Correspondingly, the first active material layer 211 of the first electrode 21 includes a negative active material, and the second active material layer 231 of the second electrode 23 includes a positive active material. Of course, in other embodiments, the first electrode 21 can also be a positive electrode, and the second electrode 23 can be a negative electrode.

[0126] Optionally, the solid-state battery cell 20 can have various shapes, such as cuboid, cylinder, prism, or other shapes. For example, in Figures 3 and 4, the solid-state battery cell 20 has a cylindrical structure. Correspondingly, the first electrode 21, the solid electrolyte layer 22, and the second electrode 23 are all cylindrical and coaxially arranged. The solid electrolyte layer 22 covers the outside of the first electrode 21, and the second electrode 23 covers the outside of the solid electrolyte layer 22.

[0127] The solid electrolyte layer 22 is coated on the outer surface of the first active material layer 211, and the second active material layer 231 is coated on the outer surface of the solid electrolyte layer 22. That is, the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23. This allows the solid electrolyte layer 22 to not only transport ions and electrons, but also to separate the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, thereby reducing the risk of short circuit between the first electrode 21 and the second electrode 23.

[0128] For example, the solid electrolyte layer 22 may be a polymer solid electrolyte layer 22, an inorganic solid electrolyte layer 22, or a composite solid electrolyte layer 22, etc.

[0129] In this embodiment, by setting the solid electrolyte layer 22 to cover the outer surface of the first active material layer 211, and setting the second active material layer 231 of the second electrode 23 to cover the outer surface of the solid electrolyte layer 22, a solid cell 20 structure is formed with the solid electrolyte layer 22 located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23. The solid cell 20 with this structure can realize that the first electrode 21, the solid electrolyte layer 22 and the second electrode 23 are sequentially covered from the inside to the outside. On the one hand, it can reduce the manufacturing difficulty of the solid cell 20 and improve the production efficiency of the solid cell 20. On the other hand, it can alleviate the difficulty of aligning the edges of the first electrode 21, the solid electrolyte layer 22 and the second electrode 23, and reduce the phenomenon of stress concentration and damage at the edges of the first electrode 21 and the second electrode 23, thereby effectively improving the production quality of the solid cell 20.

[0130] According to some embodiments of this application, referring to Figures 4 and 6, the second electrode 23 encloses a receiving cavity 234 with an opening 233 located at one end of the second electrode 23 in a first direction X. At least a portion of the first electrode 21 is inserted into the receiving cavity 234 through the opening 233 along the first direction X, and the solid electrolyte layer 22 is located between the outer surface of the first active material layer 211 and the inner surface of the second active material layer 231.

[0131] The opening 233 is located at one end of the second electrode 23 in the first direction X, and the opening 233 is connected to the receiving cavity 234, so that the first electrode 21 is inserted into the receiving cavity 234 from the opening 233 along the first direction X.

[0132] Furthermore, the solid electrolyte layer 22 is located between the outer surface of the first active material layer 211 and the inner surface of the second active material layer 231. In other words, the solid electrolyte layer 22 is located between the outer surface of the portion of the first electrode 21 located in the receiving cavity 234 and the cavity wall of the receiving cavity 234.

[0133] In this embodiment, the second electrode 23 surrounds and forms a receiving cavity 234 with an opening 233. By setting the first electrode 21 to be inserted into the receiving cavity 234 from the opening 233 along the first direction X, and the solid electrolyte layer 22 is disposed between the outer surface of the first electrode 21 and the inner surface of the second electrode 23, the first electrode 21, the solid electrolyte layer 22 and the second electrode 23 are arranged to cover each other from the inside to the outside. The structure is simple and easy to manufacture.

[0134] In some embodiments, as shown in FIG6, along the first direction X, the first active material layer 211 does not extend beyond the end of the solid electrolyte layer 22 near the opening 233.

[0135] Optionally, along the first direction X, the first active material layer 211 does not extend beyond the end of the solid electrolyte layer 22 near the opening 233. This can be either the end of the first active material layer 211 near the opening 233 in the first direction X is flush with the end of the solid electrolyte layer 22 near the opening 233 in the first direction X, or the solid electrolyte layer 22 extends beyond the end of the first active material layer 211 near the opening 233 in the first direction X.

[0136] In this embodiment, by setting the first active material layer 211 of the first electrode 21 to not extend beyond the end of the solid electrolyte layer 22 near the opening 233 in the first direction X, the effect of the solid electrolyte layer 22 in separating the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23 can be improved. This helps to reduce the short circuit between the first electrode 21 and the second electrode 23, thereby reducing the risk of internal short circuit in the solid cell 20 during use.

[0137] In some embodiments, please continue to refer to FIG6, along the first direction X, the second active material layer 231 does not extend beyond the end of the solid electrolyte layer 22 near the opening 233.

[0138] Optionally, along the first direction X, the second active material layer 231 does not extend beyond the end of the solid electrolyte layer 22 near the opening 233. This can be either the end of the second active material layer 231 near the opening 233 in the first direction X is flush with the end of the solid electrolyte layer 22 near the opening 233 in the first direction X, or the solid electrolyte layer 22 extends beyond the end of the second active material layer 231 near the opening 233 in the first direction X.

[0139] In this embodiment, by setting the second active material layer 231 of the second electrode 23 to not extend beyond the end of the solid electrolyte layer 22 near the opening 233 in the first direction X, the effect of the solid electrolyte layer 22 in separating the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23 can be improved. This helps to reduce the short circuit between the first electrode 21 and the second electrode 23, thereby reducing the risk of internal short circuit in the solid cell 20 during use.

[0140] According to some embodiments of this application, referring to Figures 4 and 6, a receiving cavity 234 extends from one end of the first electrode 21 along the first direction X. The solid-state battery cell 20 may also include an electrode lead-out portion 24, which is electrically connected to the first electrode 21 and is located at the end of the second electrode 23 where the opening 233 is formed.

[0141] Along the first direction X, one end of the first electrode 21 extends out of the receiving cavity 234. That is, part of the first electrode 21 is located in the receiving cavity 234 and part of the first electrode 21 extends out of the opening 233. For example, in FIG6, the first current collector 212 of the first electrode 21 extends out of the receiving cavity 234 from the opening 233 along the first direction X.

[0142] For example, the electrode lead-out portion 24 is located outside the second electrode 23 and at the end of the second electrode 23 where the opening 233 is formed in the first direction X. The electrode lead-out portion 24 is connected to the end of the first current collector 212 of the first electrode 21 extending out of the receiving cavity 234, so that the electrode lead-out portion 24 can input or output the electrical energy of the first electrode 21. For example, in FIG4, the solid-state battery cell 20 is cylindrical, and correspondingly, the electrode lead-out portion 24 is also cylindrical. The second current collector 232 located outside the second electrode 23 can directly serve as the output or input electrode of the second electrode 23 to input or output the electrical energy of the second electrode 23.

[0143] In this embodiment, by setting one end of the first electrode 21 in the first direction X to extend out of the receiving cavity 234, and by providing an electrode lead-out portion 24 electrically connected to the first electrode 21 on the side of the second electrode 23 forming the opening 233, the electrode lead-out portion 24 can input or output the electrical energy of the first electrode 21. The solid-state battery cell 20 with this structure can reduce the difficulty of inputting or outputting electrical energy of the first electrode 21 of the solid-state battery cell 20, and can reduce the difficulty of subsequent assembly of the solid-state battery cell 20.

[0144] In some embodiments, as shown in FIG6, the electrode lead-out portion 24 covers the opening 233 along the first direction X. That is, the projection of the opening 233 in the first direction X is located within the electrode lead-out portion 24.

[0145] In this embodiment, by setting the electrode lead-out portion 24 to cover the opening 233 of the second electrode plate 23 along the first direction X, the electrode lead-out portion 24 can not only realize the input or output of electrical energy of the first electrode plate 21, but also block the opening 233 to a certain extent. This helps to alleviate the phenomenon of impurities or other substances entering the receiving cavity 234 from the opening 233, thereby reducing the risk of the solid-state battery cell 20 being damaged or experiencing internal short circuits during use.

[0146] According to some embodiments of this application, as shown in Figures 4 and 6, the solid-state battery cell 20 may further include an insulating member 25, which is disposed along a first direction X between the electrode lead-out portion 24 and the second electrode plate 23 to insulate and isolate the electrode lead-out portion 24 and the second electrode plate 23.

[0147] The insulating member 25 is disposed in the first direction X between the end of the second electrode 23 where the opening 233 is formed and the electrode lead-out portion 24, so that the insulating member 25 can insulate and isolate the electrode lead-out portion 24 and the second electrode 23. The insulating member 25 can be made of various materials, such as rubber, silicone or plastic.

[0148] In this embodiment, the solid-state battery cell 20 is further provided with an insulating member 25, which is disposed in the first direction X between the electrode lead-out portion 24 and the second electrode plate 23, so that the insulating member 25 can provide insulation and isolation between the electrode lead-out portion 24 and the second electrode plate 23, thereby reducing the risk of short circuit between the electrode lead-out portion 24 and the second electrode plate 23, and thus effectively improving the reliability of the solid-state battery cell 20.

[0149] According to some embodiments of this application, referring to Figures 5 and 6, the first electrode 21 further includes a first current collector 212. The first current collector 212 is inserted into the receiving cavity 234 from the opening 233 along a first direction X, and one end of the first current collector 212 extends out of the receiving cavity 234 and connects to the electrode lead-out portion 24. A first active material layer 211 is disposed on the outer surface of the portion of the first current collector 212 inserted into the receiving cavity 234, and the first active material layer 211 is located between the first current collector 212 and the solid electrolyte layer 22. In the same plane perpendicular to the first direction X, the area of ​​the orthographic projection of the first current collector 212 is smaller than the area of ​​the orthographic projection of the electrode lead-out portion 24.

[0150] The first current collector 212 and the electrode lead-out part 24 can be integrally formed or separately set. If the first current collector 212 and the electrode lead-out part 24 are separately set, the connection structure between the first current collector 212 and the electrode lead-out part 24 can be various. For example, the first current collector 212 and the electrode lead-out part 24 can be connected to each other by welding, snap-fit ​​or threaded connection.

[0151] In the same plane perpendicular to the first direction X, the area of ​​the orthographic projection of the first current collector 212 is smaller than the area of ​​the orthographic projection of the electrode lead-out portion 24. That is, in the first direction X, the electrode lead-out portion 24 covers the first current collector 212.

[0152] In this embodiment, by setting the area of ​​the projection of the electrode lead-out portion 24 in the first direction X to be larger than the area of ​​the projection of the first current collector 212 in the first direction X, the area of ​​the electrode lead-out portion 24 used for interconnection with other components is larger than that of the first current collector 212. This effectively increases the area of ​​the first electrode 21 of the solid-state battery cell 20 used for interconnection with other components. On the one hand, this reduces the difficulty of subsequent assembly of the solid-state battery cell 20, which is beneficial to improving the assembly efficiency of the solid-state battery cell 20. On the other hand, it increases the current flow area between the first electrode 21 of the solid-state battery cell 20 and other components, which is beneficial to improving the performance of the solid-state battery cell 20.

[0153] In some embodiments, as shown in FIG6, the electrode lead-out portion 24 and the first current collector 212 are integrally formed. That is, the electrode lead-out portion 24 and the first current collector 212 are integral structures, and the electrode lead-out portion 24 and the first current collector 212 can be formed by integral forming processes such as casting or milling.

[0154] In this embodiment, by setting the electrode lead-out portion 24 and the first current collector 212 of the first electrode plate 21 as an integrally formed structure, the reliability and stability of the connection between the electrode lead-out portion 24 and the first current collector 212 can be improved, which helps to reduce the phenomenon of the electrode lead-out portion 24 and the first current collector 212 detaching from each other during use, thereby reducing the risk of connection failure of the solid-state battery cell 20 during use.

[0155] According to some embodiments of this application, as shown in Figures 4, 5 and 6, the solid-state battery cell 20 is cylindrical, and the central axis of the solid-state battery cell 20 extends along the first direction X.

[0156] For example, in FIG6, the first electrode 21 is cylindrical and its central axis extends along the first direction X. The solid electrolyte layer 22 and the second electrode 23 are both cylindrical and hollow structures with one end open in the first direction X. The solid electrolyte layer 22 is inserted inside the second electrode 23 and the first electrode 21 is inserted inside the solid electrolyte layer 22. Of course, in other embodiments, the solid electrolyte layer 22 and the second electrode 23 may also be both cylindrical and hollow structures with both ends open in the first direction X, such that the solid electrolyte layer 22 surrounds the outer periphery of the first electrode 21 around its central axis, and correspondingly, the second electrode 23 surrounds the outer periphery of the solid electrolyte layer 22 around its central axis.

[0157] In this embodiment, by setting the solid-state battery cell 20 to a cylindrical shape, the difficulty of sequentially covering the first electrode 21, the solid electrolyte layer 22, and the second electrode 23 from the inside out can be reduced, and the shape regularity of the first electrode 21, the solid electrolyte layer 22, and the second electrode 23 can be improved, thereby further reducing the manufacturing difficulty of the solid-state battery cell 20. On the other hand, it can also further alleviate the difficulty of aligning the edges of the first electrode 21, the solid electrolyte layer 22, and the second electrode 23, which is conducive to further improving the production quality of the solid-state battery cell 20.

[0158] According to some embodiments of this application, this application also provides a battery 100, which includes a solid-state cell 20 of any of the above schemes.

[0159] As shown in Figures 2 and 3, the battery 100 may also include a housing 10, in which the solid-state battery cell 20 is housed.

[0160] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the solid-state battery cell 20.

[0161] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0162] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2, the box 10 is a cuboid structure.

[0163] Optionally, the solid-state battery cell 20 disposed within the housing 10 can be one or more. For example, in Figure 2, the housing 10 of the battery 100 contains multiple solid-state battery cells 20. These cells can be connected in series, parallel, or a combination thereof. A combination thereof means that some of the cells are connected in series while others are connected in parallel. The multiple solid-state battery cells 20 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of these cells is housed within the housing 10. Alternatively, the battery 100 can also consist of multiple solid-state battery cells 20 first connected in series, parallel, or a combination thereof to form a battery module, and then these battery modules are connected in series, parallel, or a combination thereof to form a whole, which is then housed within the housing 10.

[0164] The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component that connects multiple solid-state cells 20 to achieve electrical connection between the multiple solid-state cells 20.

[0165] It should be noted that in some embodiments, the battery 100 may not have a housing 10. The battery 100 includes multiple solid-state cells 20, and the battery 100 composed of multiple solid-state cells 20 can be directly mounted onto an electrical device to provide power to the electrical device through the multiple solid-state cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0166] According to some embodiments of this application, this application also provides an electrical device, which includes a battery 100 of any of the above schemes, and the battery 100 is used to provide electrical energy to the electrical device.

[0167] The electrical device can be any of the aforementioned devices or systems that use battery 100.

[0168] According to some embodiments of this application, referring to Figures 4, 5, and 6, and further referring to Figure 7, Figure 7 is a schematic flowchart of a method for manufacturing a solid-state battery cell 20 provided in some embodiments of this application. This application also provides a method for manufacturing a solid-state battery cell 20, applicable to any of the above-described solid-state battery cells 20. The method for manufacturing a solid-state battery cell 20 includes:

[0169] S100: Provides the first electrode 21;

[0170] S200: The first electrode 21 is immersed in a solid electrolyte slurry to attach the solid electrolyte slurry to the outer surface of the first active material layer 211 of the first electrode 21 and form a solid electrolyte layer 22.

[0171] S300: The second electrode 23 is disposed on the outer surface of the solid electrolyte layer 22, so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, and the polarities of the first electrode 21 and the second electrode 23 are opposite.

[0172] The first electrode 21 further includes a first current collector 212, and a first active material layer 211 is disposed on the surface of the first current collector 212 facing the solid electrolyte layer 22. The second electrode 23 further includes a second current collector 232, and a second active material layer 231 is disposed on the surface of the second current collector 232 facing the solid electrolyte layer 22, such that the first active material layer 211 and the solid electrolyte layer 22 of the first electrode 21 are facing each other, and the second active material layer 231 and the solid electrolyte layer of the second electrode 23 are also facing each other.

[0173] In step S200, after the first electrode 21 is immersed in the solid electrolyte slurry, the solid electrolyte slurry can be attached to the outer surface of the first active material layer 211 of the first electrode 21, and after the first electrode 21 is removed from the solid electrolyte slurry and dried, a solid electrolyte layer 22 can be formed on the outer surface of the first active material layer 211 of the first electrode 21.

[0174] In step S300, the second electrode 23 is disposed on the outer surface of the solid electrolyte layer 22. That is, the first electrode 21 is wrapped around the side of the solid electrolyte layer 22 away from the first electrode 21, and the second active material layer 231 of the second electrode 23 and the solid electrolyte layer 22 are arranged facing each other. Optionally, there are various methods to dispose of the second electrode 23 on the outer surface of the solid electrolyte layer 22. For example, the second electrode 23 can be wrapped around the outside of the solid electrolyte layer 22 directly, or the second active material layer 231 can be disposed on the outer surface of the solid electrolyte layer 22 by immersion and then the second current collector 232 is disposed.

[0175] In this embodiment, the first electrode 21 is first immersed in a solid electrolyte slurry to adhere the solid electrolyte slurry to the outer surface of the first active material layer 211 of the first electrode 21, forming a solid electrolyte layer 22. Then, the second electrode 23 is disposed on the outer surface of the solid electrolyte layer 22 to form a solid battery cell 20 with the solid electrolyte layer 22 located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23. The solid battery cell 20 manufactured by this method can improve the fit between the outer surface of the first active material layer 211 and the inner surface of the solid electrolyte layer 22, resulting in a better bonding effect between the first active material layer 211 and the solid electrolyte layer 22. This ensures that the contact effect and contact area between the first active material layer 211 and the solid electrolyte layer 22 are not affected by the flatness or thickness consistency of the first active material layer 211 and the solid electrolyte layer 22, thereby improving the contact effect and contact area between the first active material layer 211 and the solid electrolyte layer 22, which is beneficial to improving the production quality and performance of the solid battery cell 20.

[0176] According to some embodiments of this application, referring to FIG7 and further referring to FIG8, FIG8 is a schematic flowchart of step S100 of the manufacturing method of solid-state battery cell 20 provided in some embodiments of this application. Step S100: Providing the first electrode 21 may include:

[0177] S110: Provides the first current collector 212;

[0178] S120: The first current collector 212 is immersed in the first active material slurry to attach the first active material slurry to the outer surface of the first current collector 212 and form the first active material layer 211.

[0179] The first current collector 212 is made of metal, such as copper, aluminum, or aluminum alloy.

[0180] In step S120, after the first current collector 212 is immersed in the first active substance slurry, the first active substance slurry can be attached to the outer surface of the first current collector 212, and after the first current collector 212 is taken out of the first active substance slurry and dried, a first active substance layer 211 can be formed on the outer surface of the first current collector 212.

[0181] In this embodiment, during the production process of the first electrode 21, the first current collector 212 of the first electrode 21 is first immersed in the first active material slurry. After the first active material slurry is attached to the outer surface of the first current collector 212 of the first electrode 21, a first active material layer 211 is formed. The solid-state battery cell 20 manufactured by this method can improve the fit between the outer surface of the first current collector 212 and the inner surface of the first active material layer 211, resulting in a better bonding effect between the first active material layer 211 and the first current collector 212. On the one hand, it can improve the reliability and stability of the first active material layer 211 on the first current collector 212, which helps to reduce the phenomenon of the first active material layer 211 and the first current collector 212 detaching from each other. On the other hand, it can improve the contact effect and contact area between the first active material layer 211 and the first current collector 212, which is beneficial to improving the production quality and performance of the solid-state battery cell 20.

[0182] In some embodiments, referring to Figures 5, 6, and 8, and further referring to Figure 9, Figure 9 is a schematic flowchart of step S120 of step S100 of the manufacturing method of solid-state battery cell 20 provided in some embodiments of this application. Step S120: Immersing the first current collector 212 in a first active material slurry to attach the first active material slurry to the outer surface of the first current collector 212 and form a first active material layer 211 may include:

[0183] S121: Immerse one end of the first current collector 212 in the first active substance slurry so that the first active substance slurry is attached to both the outer peripheral surface of the first current collector 212 and the end face of the first current collector 212 immersed in the first active substance slurry, and a first active substance layer 211 is formed.

[0184] The first current collector 212 is cylindrical. After one end of the first current collector 212 is inserted into the first active material slurry, a first active material layer 211 is formed on both the end face and the outer peripheral surface of the first current collector 212. This makes the first active material layer 211 a hollow structure with one end open, and the first current collector 212 is inserted into the first active material layer 211.

[0185] In this embodiment, during the production of the first electrode 21, one end of the first current collector 212 is immersed in the first active material slurry, so that the first active material slurry can be attached to both the outer peripheral surface of the first current collector 212 and the end face of one end of the first current collector 212, forming a first active material layer 211. This allows the first active material layer 211 to cover the outside of the first current collector 212 and form a shell-like structure with one open end. The solid-state battery cell 20 manufactured using this method can, on the one hand, further improve the reliability and stability of the first active material layer 211 on the first current collector 212, which helps to reduce the phenomenon of the first active material layer 211 detaching from the first current collector 212. On the other hand, it can also increase the amount of the first active material layer 211 attached to the outer surface of the first current collector 212, which is beneficial to improving the capacity of the solid-state battery cell 20.

[0186] According to some embodiments of this application, referring to Figures 7 and 8, after step S120: immersing the first current collector 212 in the first active material slurry to attach the first active material slurry to the outer surface of the first current collector 212 and form the first active material layer 211, step S100: providing the first electrode 21 may further include:

[0187] S130: Dry the first active material layer 211.

[0188] After the first active material slurry is attached to the outer surface of the first current collector 212 and a first active material layer 211 is formed, the first active material layer 211 can be dried to increase the drying rate of the first active material layer 211. Optionally, the drying method of the first active material layer 211 can be various. For example, the first active material layer 211 can be dried by high temperature drying or by air blowing.

[0189] In this embodiment, during the production of the first electrode 21, the first current collector 212 is immersed in the first active material slurry to form the first active material layer 211, and then the first active material layer 211 is dried. On the one hand, this can improve the drying efficiency of the first active material layer 211, which is beneficial to improving the production efficiency of the solid-state battery cell 20, and also helps to reduce the phenomenon of local peeling of the first active material layer 211 during the drying process, thereby improving the production quality of the first electrode 21 and improving the stability of the first active material layer 211 on the first current collector 212. On the other hand, it facilitates the subsequent attachment of solid electrolyte slurry to the outer surface of the first active material layer 211 to form a solid electrolyte layer 22, which is beneficial to improving the quality of the solid electrolyte layer 22 covering the outer surface of the first active material layer 211, thereby improving the production quality of the solid-state battery cell 20.

[0190] According to some embodiments of this application, referring to FIG7 and further referring to FIG10, FIG10 is a schematic flowchart of step S300 of the manufacturing method of solid-state battery cell 20 provided in some embodiments of this application. Step S300: Disposing the second electrode 23 on the outer surface of the solid electrolyte layer 22, so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23 may include:

[0191] S310: The solid electrolyte layer 22 is immersed in the second active material slurry to attach the second active material slurry to the outer surface of the solid electrolyte layer 22 and form the second active material layer 231.

[0192] S320: The second current collector 232 is disposed on the outer surface of the second active material layer 231.

[0193] In step S310, after the first electrode 21 with the solid electrolyte layer 22 is immersed in the second active material slurry, the second active material slurry can be attached to the outer surface of the solid electrolyte layer 22. After the solid electrolyte layer 22 is removed from the second active material slurry and dried, the second active material layer 231 can be formed on the outer surface of the solid electrolyte layer 22.

[0194] In step S320, after the second active material layer 231 is formed on the outer surface of the solid electrolyte layer 22, the second current collector 232 of the second electrode 23 is then disposed on the outer surface of the second active material layer 231. Of course, the structure of the second current collector 232 disposed on the outer surface of the second active material layer 231 can be various. For example, the second current collector 232 can be directly coated on the outer surface of the second active material layer 231, or the metal material of the second current collector 232 can be melted into a liquid state first, and then the second current collector 232 can be formed on the outer surface of the second active material layer 231 by immersion.

[0195] In this embodiment, during the production process of setting the second electrode 23 on the outer surface of the solid electrolyte layer 22, the first electrode 21 with the solid electrolyte layer 22 is first immersed in the second active material slurry to adhere the second active material slurry to the outer surface of the solid electrolyte layer 22 and form the second active material layer 231. Then, the second current collector 232 is set on the outer surface of the second active material layer 231 to realize the setting of the second electrode 23 on the outer surface of the solid electrolyte layer 22. The solid battery cell 20 manufactured by this method can improve the fit between the outer surface of the solid electrolyte layer 22 and the inner surface of the second active material layer 231, so that the bonding effect between the second active material layer 231 and the solid electrolyte layer 22 is better. Thus, the contact effect and contact area between the second active material layer 231 and the solid electrolyte layer 22 are not affected by the flatness or thickness consistency of the second active material layer 231 and the solid electrolyte layer 22, thereby improving the contact effect and contact area between the second active material layer 231 and the solid electrolyte layer 22, which is conducive to further improving the production quality and performance of the solid battery cell 20.

[0196] In some embodiments, referring to FIG10 and further referring to FIG11, FIG11 is a schematic flowchart of step S320 of step S300 of the manufacturing method of solid-state battery cell 20 provided in some embodiments of this application. Step S320: Disposing the second current collector 232 on the outer surface of the second active material layer 231 may include:

[0197] S321: The second active material layer 231 is immersed in molten metal liquid to attach the metal liquid to the outer surface of the second active material layer 231, and the metal liquid attached to the outer surface of the second active material layer 231 solidifies to form the second current collector 232.

[0198] In step S321, the second current collector 232 is made of metal. First, the second current collector 232 is provided in a molten metal liquid state. Then, the second active material layer 231 is immersed in the metal liquid. After the second active material layer 231 is taken out of the metal liquid and solidified, the second current collector 232 can be formed on the outer surface of the second active material layer 231.

[0199] For example, the material of the second current collector 232 can be various, such as copper, aluminum or aluminum alloy.

[0200] In this embodiment, after a second active material layer 231 is formed on the outer surface of the solid electrolyte layer 22, the first electrode 21, on which the solid electrolyte layer 22 and the second active material layer 231 are formed, is immersed in molten metal. The molten metal adhering to the outer surface of the second active material layer 231 solidifies to form a second current collector 232, thereby forming the second electrode 23 on the outer surface of the second active material layer 231. Solid-state cells 20 manufactured using this method are easier to manufacture and reduce the formation of the second current collector 232 on the outer surface of the second active material layer 231. This reduces the difficulty of production and improves the efficiency of the solid-state battery cell 20. On the other hand, it can improve the fit between the inner surface of the second current collector 232 and the outer surface of the second active material layer 231, resulting in a better adhesion between the second active material layer 231 and the second current collector 232. This is beneficial to improving the reliability and stability of the second active material layer 231 on the second current collector 232, reducing the phenomenon of the second active material layer 231 and the second current collector 232 detaching from each other, and also improving the contact effect and contact area between the second active material layer 231 and the second current collector 232, thereby further improving the production quality and performance of the solid-state battery cell 20.

[0201] According to some embodiments of this application, referring to Figures 5, 6, and 10, and further referring to Figure 12, Figure 12 is a schematic flowchart of step S310 of step S300 of the manufacturing method of solid-state battery cell 20 provided in some embodiments of this application. Step S310: Immersing the solid electrolyte layer 22 in a second active material slurry to attach the second active material slurry to the outer surface of the solid electrolyte layer 22 and form a second active material layer 231 may include:

[0202] S311: Immerse one end of the solid electrolyte layer 22 in the second active material slurry so that the second active material slurry is attached to both the outer peripheral surface of the solid electrolyte layer 22 and the end face of the solid electrolyte layer 22 immersed in the second active material slurry, thus forming the second active material layer 231.

[0203] The first electrode 21 is cylindrical, so the solid electrolyte layer 22 disposed on the outer surface of the first active material layer 211 of the first electrode 21 is also cylindrical. After one end of the solid electrolyte layer 22 is inserted into the second active material slurry, a second active material layer 231 can be formed on both the end face and the outer peripheral surface of the solid electrolyte layer 22. The second active material layer 231 is a hollow structure with one end open, and the solid electrolyte layer 22 is inserted into the second active material layer 231.

[0204] In this embodiment, during the process of setting the second electrode 23 on the outer surface of the solid electrolyte, one end of the solid electrolyte layer 22 is immersed in the second active material slurry, so that the second active material slurry can be attached to both the outer peripheral surface of the solid electrolyte layer 22 and the end face of one end of the solid electrolyte layer 22, forming a second active material layer 231. Thus, the second active material layer 231 covers the outside of the solid electrolyte layer 22 and forms a shell-like structure with one end open. The solid battery cell 20 manufactured by this method can, on the one hand, further improve the reliability and stability of the second active material layer 231 set on the solid electrolyte layer 22, which is conducive to reducing the phenomenon of the second active material layer 231 detaching from the solid electrolyte layer 22. On the other hand, it can also increase the amount of the second active material layer 231 attached to the outer surface of the solid electrolyte layer 22, which is conducive to improving the capacity of the solid battery cell 20.

[0205] According to some embodiments of this application, referring to FIG10, before step S320: disposing the second current collector 232 on the outer surface of the second active material layer 231, step S300: disposing the second electrode 23 on the outer surface of the solid electrolyte layer 22, so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, may further include:

[0206] S330: Dry the second active material layer 231.

[0207] Specifically, step S330: drying the second active material layer 231 is performed before step S320: the second current collector 232 is disposed on the outer surface of the second active material layer 231, and after step S310: the solid electrolyte layer 22 is immersed in the second active material slurry to attach the second active material slurry to the outer surface of the solid electrolyte layer 22 and form the second active material layer 231.

[0208] It should be noted that after the second active material slurry is attached to the outer surface of the solid electrolyte layer 22 and the second active material layer 231 is formed, the second active material layer 231 can be dried to increase the drying rate of the second active material layer 231. Optionally, the drying method of the second active material layer 231 can be various, such as high temperature drying or air blowing drying.

[0209] In this embodiment, before the second current collector 232 is disposed on the outer surface of the second active material layer 231, the second active material layer 231 formed on the outer surface of the solid electrolyte layer 22 is dried. This improves the drying efficiency of the second active material layer 231, which is beneficial to improving the production efficiency of the solid-state battery cell 20. It also helps to reduce the phenomenon of local detachment of the second active material layer 231 during the drying process, thereby improving the production quality of the solid-state battery cell 20 and enhancing the stability of the second active material layer 231 disposed on the outer surface of the solid electrolyte layer 22. Furthermore, it facilitates the subsequent placement of the second current collector 232 on the outer surface of the second active material layer 231, which improves the quality of the second current collector 232 disposed on the outer surface of the second active material layer 231, thereby improving the production quality of the solid-state battery cell 20.

[0210] It should be noted that the manufacturing method of setting the second electrode 23 on the outer surface of the solid electrolyte layer 22 in step S300 can be varied. For example, in some embodiments, referring to Figure 7 and further referring to Figure 13, Figure 13 is a flowchart illustrating step S300 of the manufacturing method of the solid cell 20 provided in some embodiments of this application. Step S300: Setting the second electrode 23 on the outer surface of the solid electrolyte layer 22 so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23 may include:

[0211] S340: Provide a second current collector 232, the interior of which forms an accommodating space 2321 open at one end (as shown in Figure 6);

[0212] S350: Injecting a second active substance slurry into the containment space 2321;

[0213] S360: The solid electrolyte layer 22 is inserted into the second active material slurry to form a second active material layer 231 on the side of the second current collector 232 facing the solid electrolyte layer 22.

[0214] The second current collector 232 is a hollow structure with one end open, so that the internal space 2321 of the second current collector 232 can accommodate the insertion of the first electrode 21 on which the solid electrolyte layer 22 is provided, and can also be used to accommodate the second active material slurry.

[0215] In step S360, after injecting the second active material slurry into the receiving space 2321 of the second current collector 232, inserting the first electrode 21 with the solid electrolyte layer 22 into the receiving space 2321 allows the solid electrolyte layer 22 to be immersed in the second active material slurry, so that the second active material slurry is located between the second current collector 232 and the solid electrolyte layer 22, thereby forming the second active material layer 231 between the second current collector 232 and the solid electrolyte layer 22 after the second active material slurry dries.

[0216] In this embodiment, during the process of setting the second electrode 23 on the outer surface of the solid electrolyte, the second current collector 232 is first configured to have an internally formed receiving space 2321 with one open end. Then, the second active material slurry is injected into the receiving space 2321. Finally, the first electrode 21 with the solid electrolyte layer 22 is inserted into the second active material slurry, thereby forming the second active material layer 231 between the second current collector 232 and the solid electrolyte layer 22. This achieves the setting of the second electrode 23 on the outer surface of the solid electrolyte layer 22. The solid-state battery cell 20 manufactured using this method can reduce the number of electrodes on the outer surface of the solid electrolyte layer 22. The second electrode 23 is easier to implement than the simpler one. On the other hand, it can improve the fit between the outer surface of the solid electrolyte layer 22 and the inner surface of the second active material layer 231, as well as between the outer surface of the second active material layer 231 and the inner surface of the second current collector 232. This results in better adhesion between the second active material layer 231 and the solid electrolyte layer 22, and between the second active material layer 231 and the second current collector 232. Consequently, it can improve the contact effect and contact area between the second active material layer 231 and the solid electrolyte layer 22, and between the second active material layer 231 and the second current collector 232, which is beneficial to further improve the production quality and performance of the solid-state battery cell 20.

[0217] In some embodiments, referring to FIG13, after step S360: inserting the solid electrolyte layer 22 into the second active material slurry to form the second active material layer 231 on the side of the second current collector 232 facing the solid electrolyte layer 22, step S300: disposing the second electrode 23 on the outer surface of the solid electrolyte layer 22, so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, may further include:

[0218] S370: Dry the second active material layer 231.

[0219] After the solid electrolyte layer 22 is inserted into the second active material slurry in the accommodating space 2321 of the second current collector 232 and forms the second active material layer 231, the second active material layer 231 can be dried to increase the drying rate of the second active material layer 231. Optionally, the drying method of the second active material layer 231 can be various, such as high temperature drying or air blowing drying.

[0220] In this embodiment, after the solid electrolyte is inserted into the second active material slurry and a second active material layer 231 is formed between the second current collector 232 and the solid electrolyte layer 22, the second active material layer 231 is dried. This helps to improve the drying efficiency of the second active material layer 231 disposed between the second current collector 232 and the solid electrolyte layer 22, thereby improving the production efficiency of the solid battery cell 20.

[0221] According to some embodiments of this application, referring to Figures 5, 6, and 7, and further referring to Figure 14, Figure 14 is a schematic flowchart of step S200 of the manufacturing method of solid-state battery cell 20 provided in some embodiments of this application. Step S200: Immersing the first electrode 21 in a solid electrolyte slurry to adhere the solid electrolyte slurry to the outer surface of the first active material layer 211 of the first electrode 21 and form a solid electrolyte layer 22 may include:

[0222] S210: Immerse one end of the first electrode 21 in the solid electrolyte slurry so that the solid electrolyte slurry is attached to both the outer peripheral surface of the first electrode 21 and the end face of the first electrode 21 immersed in the solid electrolyte slurry, and a solid electrolyte layer 22 is formed.

[0223] The first electrode 21 is cylindrical. After one end of the first electrode 21 is inserted into the solid electrolyte slurry, a solid electrolyte layer 22 can be formed on both the end face and the outer peripheral surface of the first electrode 21. This makes the solid electrolyte layer 22 a hollow structure with one end open, and the first electrode 21 is inserted into the solid electrolyte layer 22.

[0224] In this embodiment, by immersing one end of the first electrode 21 in a solid electrolyte slurry, the solid electrolyte slurry can be attached to both the outer peripheral surface of the first electrode 21 and the end face of one end of the first electrode 21, forming a solid electrolyte layer 22. This allows the solid electrolyte layer 22 to cover the outside of the first electrode 21 and form a shell-like structure with one end open. The solid battery cell 20 manufactured using this method can further improve the effect of the solid electrolyte layer 22 in separating the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, which helps to reduce the risk of short circuit during the use of the solid battery cell 20.

[0225] According to some embodiments of this application, referring to FIG7, in step S300: before the second electrode 23 is disposed on the outer surface of the solid electrolyte layer 22 so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, the manufacturing method of the solid cell 20 may further include:

[0226] S400: Dry the solid electrolyte layer 22.

[0227] In step S400: Drying the solid electrolyte layer 22 is performed after step S300: the second electrode 23 is disposed on the outer surface of the solid electrolyte layer 22 so that the solid electrolyte layer 22 is located between the first active material layer 211 of the first electrode 21 and the second active material layer 231 of the second electrode 23, and after step S200: the first electrode 21 is immersed in the solid electrolyte slurry so that the solid electrolyte slurry is attached to the outer surface of the first active material layer 211 of the first electrode 21 and the solid electrolyte layer 22 is formed.

[0228] It should be noted that after the solid electrolyte slurry is attached to the outer surface of the first active material layer 211 and a solid electrolyte is formed, the solid electrolyte layer 22 can be dried to increase the drying rate of the solid electrolyte layer 22. Optionally, the solid electrolyte layer 22 can be dried in various ways, such as high-temperature drying or air drying.

[0229] In this embodiment, before the second electrode 23 is disposed on the outer surface of the solid electrolyte, the solid electrolyte layer 22 is dried. This can improve the efficiency of the solid electrolyte layer 22, which is beneficial to improving the production efficiency of the solid battery cell 20, and can also reduce the phenomenon of local peeling of the solid electrolyte layer 22 during the drying process, thereby improving the production quality of the solid battery cell 20. It can also improve the stability of the solid electrolyte layer 22 disposed on the first active material layer 211. On the other hand, it can facilitate the subsequent disposal of the second electrode 23 on the outer surface of the solid electrolyte layer 22, which is beneficial to improving the quality of the second electrode 23 disposed on the solid electrolyte layer 22, thereby improving the production quality of the solid battery cell 20.

[0230] It should be noted that the relevant structure of the solid-state battery cell 20 manufactured by the manufacturing method provided in the above embodiments can be found in the solid-state battery cell 20 provided in the foregoing embodiments, and will not be repeated here.

[0231] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0232] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for manufacturing a solid-state battery cell, comprising: Provide the first electrode; The first electrode is immersed in a solid electrolyte slurry to attach the solid electrolyte slurry to the outer surface of the first active material layer of the first electrode and form a solid electrolyte layer. A second electrode is disposed on the outer surface of the solid electrolyte layer, such that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, wherein the polarities of the first electrode and the second electrode are opposite.

2. The method for manufacturing a solid-state battery cell according to claim 1, wherein, The provision of the first electrode includes: Provide the first current collector; The first current collector is immersed in the first active substance slurry to attach the first active substance slurry to the outer surface of the first current collector and form the first active substance layer.

3. The method for manufacturing a solid-state battery cell according to claim 2, wherein, The step of immersing the first current collector in a first active substance slurry to attach the first active substance slurry to the outer surface of the first current collector and form the first active substance layer includes: One end of the first current collector is immersed in the first active substance slurry, so that the first active substance slurry is attached to both the outer peripheral surface of the first current collector and the end face of the first current collector immersed in the first active substance slurry, and the first active substance layer is formed.

4. The method for manufacturing a solid-state battery cell according to claim 2 or 3, wherein, After immersing the first current collector in a first active material slurry to attach the first active material slurry to the outer surface of the first current collector and form the first active material layer, the provision of the first electrode further includes: Dry the first active material layer.

5. The method for manufacturing a solid-state battery cell according to any one of claims 1-4, wherein, The step of disposing the second electrode on the outer surface of the solid electrolyte layer, such that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, includes: The solid electrolyte layer is immersed in a second active substance slurry to attach the second active substance slurry to the outer surface of the solid electrolyte layer and form the second active substance layer. The second current collector is disposed on the outer surface of the second active material layer.

6. The method for manufacturing a solid-state battery cell according to claim 5, wherein, The step of disposing the second current collector on the outer surface of the second active material layer includes: The second active material layer is immersed in molten metal to attach the molten metal to the outer surface of the second active material layer, and the molten metal attached to the outer surface of the second active material layer solidifies to form the second current collector.

7. The method for manufacturing a solid-state battery cell according to claim 5 or 6, wherein, The step of immersing the solid electrolyte layer in a second active substance slurry to adhere the second active substance slurry to the outer surface of the solid electrolyte layer and form the second active substance layer includes: One end of the solid electrolyte layer is immersed in the second active substance slurry, so that the second active substance slurry is attached to both the outer peripheral surface of the solid electrolyte layer and the end face of the solid electrolyte layer immersed in the second active substance slurry, thus forming the second active substance layer.

8. The method for manufacturing a solid-state battery cell according to any one of claims 5-7, wherein, Before disposing the second current collector on the outer surface of the second active material layer, the step of disposing the second electrode on the outer surface of the solid electrolyte layer, such that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, further includes: Dry the second active material layer.

9. The method for manufacturing a solid-state battery cell according to any one of claims 1-4, wherein, The step of disposing the second electrode on the outer surface of the solid electrolyte layer, such that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, includes: A second current collector is provided, the interior of which has an open-end receiving space; Inject a second active substance slurry into the containing space; The solid electrolyte layer is inserted into the second active material slurry to form the second active material layer on the side of the second current collector facing the solid electrolyte layer.

10. The method for manufacturing a solid-state battery cell according to claim 9, wherein, After inserting the solid electrolyte layer into the second active material slurry to form the second active material layer on the side of the second current collector facing the solid electrolyte layer, the step of disposing the second electrode on the outer surface of the solid electrolyte layer, such that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, further includes: Dry the second active material layer.

11. The method for manufacturing a solid-state battery cell according to any one of claims 1-10, wherein, The step of immersing the first electrode in a solid electrolyte slurry to attach the solid electrolyte slurry to the outer surface of the first active material layer of the first electrode and form a solid electrolyte layer includes: One end of the first electrode is immersed in the solid electrolyte slurry, so that the solid electrolyte slurry is attached to both the outer peripheral surface of the first electrode and the end face of the first electrode immersed in the solid electrolyte slurry, thus forming the solid electrolyte layer.

12. The method for manufacturing a solid-state battery cell according to any one of claims 1-11, wherein, Before the second electrode is disposed on the outer surface of the solid electrolyte layer, such that the solid electrolyte layer is located between the first active material layer of the first electrode and the second active material layer of the second electrode, the method for manufacturing the solid-state battery cell further includes: Dry the solid electrolyte layer.

13. A solid-state battery cell (20), comprising: The first electrode (21) includes a first active material layer (211); A solid electrolyte layer (22) is coated on the outer surface of the first active material layer (211); as well as The second electrode (23) has the opposite polarity to the first electrode (21). The second electrode (23) includes a second active material layer (231) which covers the outer surface of the solid electrolyte layer (22).

14. The solid-state battery cell (20) according to claim 13, wherein, The second electrode (23) encloses and forms a receiving cavity (234) with an opening (233), the opening (233) being located at one end of the second electrode (23) in a first direction (X); At least a portion of the first electrode (21) is inserted into the receiving cavity (234) from the opening (233) along the first direction (X), and the solid electrolyte layer (22) is located between the outer surface of the first active material layer (211) and the inner surface of the second active material layer (231).

15. The solid-state battery cell (20) according to claim 14, wherein, Along the first direction (X), the first active material layer (211) does not extend beyond the solid electrolyte layer (22) near the end of the opening (233).

16. The solid-state battery cell (20) according to claim 14 or 15, wherein, Along the first direction (X), the second active material layer (231) does not extend beyond the solid electrolyte layer (22) near the end of the opening (233).

17. The solid-state battery cell (20) according to any one of claims 14-16, wherein, Along the first direction (X), one end of the first electrode (21) extends out of the receiving cavity (234); The solid-state battery cell (20) further includes an electrode lead-out portion (24), which is electrically connected to the first electrode (21) and is located at one end of the second electrode (23) where the opening (233) is formed.

18. The solid-state battery cell (20) according to claim 17, wherein, Along the first direction (X), the electrode lead-out portion (24) covers the opening (233).

19. The solid-state battery cell (20) according to claim 17 or 18, wherein, The solid-state battery cell (20) also includes: An insulating member (25) is disposed between the electrode lead-out portion (24) and the second electrode plate (23) along the first direction (X) to insulate and isolate the electrode lead-out portion (24) and the second electrode plate (23).

20. The solid-state battery cell (20) according to any one of claims 17-19, wherein, The first electrode (21) also includes: A first current collector (212) is inserted into the receiving cavity (234) from the opening (233) along the first direction (X), and one end of the first current collector (212) extends out of the receiving cavity (234) and is connected to the electrode lead-out portion (24). A first active material layer (211) is disposed on the outer surface of the portion of the first current collector (212) inserted into the receiving cavity (234). The first active material layer (211) is located between the first current collector (212) and the solid electrolyte layer (22). In the same plane perpendicular to the first direction (X), the area of ​​the orthographic projection of the first current collector (212) is smaller than the area of ​​the orthographic projection of the electrode lead-out portion (24).

21. The solid-state battery cell (20) according to claim 20, wherein, The electrode lead-out portion (24) is integrally formed with the first current collector (212).

22. The solid-state battery cell (20) according to any one of claims 13-21, wherein, The solid-state battery cell (20) is cylindrical.

23. A battery (100) comprising a solid-state cell (20) as claimed in any one of claims 13-22.

24. An electrical device comprising a battery (100) as claimed in claim 23, the battery (100) being used to provide electrical energy.

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